Chirag Jog wrote: > * Gilles Carry <Gilles.Carry@xxxxxxxx> [2008-10-03 15:46:59]: > > >> Sorry Greg, >> >> Neither PPC64 nor Intel64 make it with this patch. >> At boot time, it stops at the BUG_ON you added: >> 0xc00000000004eca4 is in push_rt_task (kernel/sched_rt.c:1102) >> > I am also confirming this issue gilles reported. > > Although, i have a question: > When we enable group scheduling (CONFIG_RT_GROUP_SCHED), > all the problems disappear. > After skimming through the rt scheduler code, I don't feel group > scheduling alters the behavior of push/pull strategies in any way. > > So I am wonder whether enabling group scheduling > actually solves the problem or just makes it tough > to recreate? > Hi Chirag, The issue that Gilles pointed me at is a race condition. I do not suspect GROUP_SCHED itself has anything to do with the problem other than it changes the timing. HTH! -Greg
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